They should start losing money soon as tourists from around the world start going to Vietnam, Philippines, Indonesia, etc etc
Indonesia and Philippines have massive potential. Cambodia and Laos together probably have as much potential as Thailand. Vietnam has plenty of potential, probably lot more going for it than Thailand.
Thailand has long been the gateway country to travel in this part of Asia, but it's only a matter of time before neighbouring countries that have more to offer take market share, (hopefully 🤞)